Omaha Scientific Supply Company began offering geiger counter instruments in 1948. They were located at 3601 North 24^th Street in 1949. In 1950, they moved to 3623 Lake Street in Omaha, Nebraska. The company was founded by Shadwick and Berry. They offered a series of instruments designated from TX-4 to TX-12.

Omaha Scientific Model TX-4 1949

Omaha Scientific Ad 1950's

The Model TX-4 was designated the “Uranium Bug”. The unit was designed for both prospectors and mineralogists. It is self-contained with batteries, internal geiger counter, headphones and weighed 3.5 lbs.

The Model TX-5 was a small, lightweight battery operated unit for uranium prospecting. It came with headphones which provided the clicks for indications of radioactive materials. The detector was housed in an external probe. It was advertised as a geiger counter for every use - oil prospecting, mineral location, hospital work, and industrial use. The unit had a 900-volt geiger tube powered by three 300 volt batteries. The three batteries resulted in a large heavy unit. Shadwick is credited with developing the first argon-filled geiger tube.

Omaha Scientific Model TX-5 1948

Popular Science Ad for Model TX-5 1948

The Model TX-6 was a field portable gamma survey meter used to detecting small increases in background counts received from radioactive ores in outcropping and surface deposits. Extensive field tests have proved it the most practical counter yet devised for rough field work. Just as sensitive as larger units but costs less. There is no guess work to the TX-6. It will react to radioactive ores instantly. The unit is completely water-proofed. It can detect deposits of carnotite, pitchblende, curite and other radioactive minerals. High and low grade ores make a different sound in the phones. Uranium has been found with the TX-6 when ore has as much as 60 feet of overburden. The unit measures 3” x 4.5” x 7.5”, weighs 4 lbs. and is housed in an aluminum case. It detects gamma and cosmic. The unit relies on only audio detection. Small enough to be carried on the belt. It uses two 1.5 and one 67.5-volt batteries. It cost $100 in 1950 as advertised in Grieger's catalog.

Omaha Scientific Model TX-6 1948

Omaha Scientific Model TX-6 1948s

Omaha Scientific Model TX-6 Grieger's Catalog1950

The Model TX-7 was a gamma survey meter introduced in 1949.

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Omaha Scientific Model TX-7 1949

The Model TX-8 was the most compact Geiger counter with rate meter ever devised! It was made to exacting specifications of one of America's foremost geological engineers and is unsurpassed for prospecting and estimating purposes. The Model TX-8 was introduced in 1950 as a portable gamma survey meter with a GM tube in an external probe. An option was a special probe for beta and gamma detection. It had either a count rate meter or headphones for indications. It had two ranges of 1,000 and 10,000 cpm. It used two 1.5 and one 67.5-volt batteries. It was rugged with anti-shock mountings and a dust free micro-polished aluminum case. This unit was designed especially for prospecting. It measures 5” x 3.25” x 7.5” and weighs less than 4 lbs. Omaha counters were used in making all but one of the major radioactive mineral strikes during the past two years. "The meter reads in counts-per-minute rather than in undecipherable medical terms." It sold for $198 in 1950 as advertised in Grieger's catalog. 

Omaha Scientific Model TX-8 1950

Omaha Scientific Model TX-8 Ads 1950's

Omaha Scientific Model TX-8 1950's

Omaha Scientific Model TX-8 Grieger's Catalog 1950

The Model TX-9 was initially offered in 1949 as a geiger counter kit. It would “take one hour to assemble for an experienced man”. The TX-9 geiger counter instrument was offered for $79 in early 1950 as a field portable instrument for detecting radioactivity in outcroppings of rocks and surface ore surveys. It detected both gamma and cosmic. Audio via headphones was the only means of indication. It used two 1.5 and one 67.5-volt batteries. The geiger tube is mounted inside the case.

Omaha Scientific Model TX-9 Kit 1949

Omaha Scientific Model TX-9 1950

Popular Science Ad 1950 for TX-9

The Model TX-12 was a gamma survey meter introduced in 1949.

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Omaha Scientific Model TX-12 1949